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The largest independent, non-commercial, consumer-oriented resource on the Internet for owners, collectors and enthusiasts of fine wristwatches. Online since 1998. | |||||||
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Vintage Heuer Discussion Forum
The place for discussing 1930-1985 Heuer wristwatches, chronographs and dash-mounted timepieces. Online since May 2003. | ||||||
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Hi and welcome.
The 1550 SG is the model reference for the Bundeswehr watch (as in Heuer's reference rather than the BW issue number); the other is the serial number.
Sinn revised a number of decommissioned watches, which were advertised for public sale in German newspapers and magazines. Off the top of my head the issue markings are usually still intact, but I wouldn't be too surprised if they were removed/obfuscated as part of that revision process for some watches.
As ever, photos would help us out a lot.
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